PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/03/21-08:28:10
G10     268.6          39.9                5.3 +/-    1.25       7.7 +/-    1.25  0.040 / 0.030
G13     41.1           16.7                2.4 +/-    1.40       5.8 +/-    1.40  0.040 / 0.040
G15     57.1           46.9                4.0 +/-    0.84       5.3 +/-    0.84  0.300 / 0.190
G16     283.4          11.2                4.6 +/-    1.42      12.6 +/-    1.42  0.150 / 0.230
G20     300.6          61.0                5.6 +/-    0.56       6.3 +/-    0.56  0.100 / 0.060
G21     17.2           73.4                5.6 +/-    0.57       5.9 +/-    0.57  0.100 / 0.070
G24     117.9          15.1                5.5 +/-    1.69      13.5 +/-    1.69  0.260 / 0.420
G27     319.1          18.1                4.0 +/-    1.56       9.2 +/-    1.56  0.190 / 0.250
G29     164.9          24.7                5.5 +/-    2.51      10.9 +/-    2.51  0.150 / 0.160